"Ron Ewing of the Firefighters Association said the trend is to require sprinklers in new construction because of increased use of lightweight and composite materials.Now what he means by "composite materials" is probably different then what we commonly think of composite materials, i.e. FRP.
Older wood-built homes could burn for about 20 minutes before they began to collapse. With new homes, that "burn time" shortens to five minutes because of the different materials used, he said."
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